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    <title>04_a标签</title>
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     <a href="https://www.baidu.com" target="_blank">百度</a> /* target="_blank"新窗口打开*/
     <a href="https://www.163.com" target="_blank">网易</a>/* href是链接协议，target="_blank"新窗口打开*/
     <a href="https://www.sohu.com" target="_blank">搜狐</a>
     <a href="https://www.sina.com.cn" target="_blank">新浪</a>
     <a href="./02_常用文本标签.html" target="_blank">文本标签</a>
     <a href="mailto:gaolingyu@itcast.cn" target="_blank">给老高发邮件</a>/* mailto是邮件协议，href="mailto:gaolingyu@itcast.cn"是收件人邮箱，target="_blank"新窗口打开*/
     <a href="tel:10086" target="_blank">给移动打电话</a> /* tel是电话拨号协议，href="tel:10086"是拨号号码，target="_blank"新窗口打开*/
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